1 // RUN: %clangxx -O0 -g %s -o %t && %run %t | FileCheck %s 2 #include <assert.h> 3 #include <stdio.h> 4 #include <string.h> 5 #include <time.h> 6 #include <sys/timerfd.h> 7 #include <unistd.h> 8 9 int main (int argc, char** argv) 10 { 11 int fd = timerfd_create(CLOCK_REALTIME, 0); 12 assert(fd >= 0); 13 14 struct itimerspec its; 15 its.it_value.tv_sec = 0; 16 its.it_value.tv_nsec = 1000000; 17 its.it_interval.tv_sec = its.it_value.tv_sec; 18 its.it_interval.tv_nsec = its.it_value.tv_nsec; 19 20 int res = timerfd_settime(fd, 0, &its, NULL); 21 assert(res != -1); 22 23 struct itimerspec its2; 24 res = timerfd_settime(fd, 0, &its, &its2); 25 assert(res != -1); 26 assert(its2.it_interval.tv_sec == its.it_interval.tv_sec); 27 assert(its2.it_interval.tv_nsec == its.it_interval.tv_nsec); 28 assert(its2.it_value.tv_sec <= its.it_value.tv_sec); 29 assert(its2.it_value.tv_nsec <= its.it_value.tv_nsec); 30 31 struct itimerspec its3; 32 res = timerfd_gettime(fd, &its3); 33 assert(res != -1); 34 assert(its3.it_interval.tv_sec == its.it_interval.tv_sec); 35 assert(its3.it_interval.tv_nsec == its.it_interval.tv_nsec); 36 assert(its3.it_value.tv_sec <= its.it_value.tv_sec); 37 assert(its3.it_value.tv_nsec <= its.it_value.tv_nsec); 38 39 40 unsigned long long buf; 41 res = read(fd, &buf, sizeof(buf)); 42 assert(res == 8); 43 assert(buf >= 1); 44 45 res = close(fd); 46 assert(res != -1); 47 48 printf("DONE\n"); 49 // CHECK: DONE 50 51 return 0; 52 } 53
